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CONFIG_ARM64_SW_TTBR0_PAN: Emulate Privileged Access Never using TTBR0_EL1 switching

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The Linux kernel configuration item CONFIG_ARM64_SW_TTBR0_PAN:

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Enabling this option prevents the kernel from accessing user-space memory directly by pointing TTBR0_EL1 to a reserved zeroed area and reserved ASID. The user access routines restore the valid TTBR0_EL1 temporarily.

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